Commercial mortgage lender Walker & Dunlop said it now expects 2013 loan volume of between $10 billion and $12 billion, up from the previous prediction of between $8 billion and $10 billion, due to its success in 2012 and the acquisition of CWCapital.

The company had volume of $7.1 billion, up 76% over 2011’s $4 billion. The numbers were enhanced by the close of the CWCapital acquisition on Sept. 4, 2012. When CWCapital’s standalone numbers are added in, the two firms did $9.5 billion in total volume last year.

By funding source, Fannie Mae supplied the money for the bulk of Walker & Dunlop’s production, $3.3 billion, followed by $1.7 billion from Freddie Mac, $1.2 billion from conduits, life companies and banks, and $858 million from the Department of Housing of Urban Development and Ginnie Mae.

Walker & Dunlop’s servicing portfolio doubled during the year, to $35.2 billion from $16.8 billion in 2011. More than half of the loans, nearly $19 billion are serviced for Fannie Mae.